06 / A ROUTINE THAT FITS
See your eating window at a glance.
Choose when eating ends and a fasting duration to calculate when the next window begins.
Map your eating window
Clock-time planning for a schedule you’ve chosen.
This tool does time arithmetic only. It does not recommend fasting, track a live fast, predict autophagy, or measure ketosis. Times are shown on a 24-hour clock and do not adjust for daylight-saving changes or travel.
Fasting is not appropriate for everyone. Seek professional advice if you are pregnant or breastfeeding, under 18, have a history of eating disorders, have diabetes, or use glucose-lowering medication.
the next day · local clock time
The default 12:12 schedule is an example. Choose a routine based on your circumstances and appropriate guidance.
Planning example only. Fasting can affect blood glucose and medication safety. Read NIDDK’s discussion of fasting and type 2 diabetes.
YOUR EVERYDAY TOOLKIT
A little help beyond the label.
Meal carb calculator
See how every part of your plate adds up.
Recipe carb calculator
From the whole batch to your own portion.
Keto macro calculator
Turn your daily targets into grams of fat.
Calorie & TDEE calculator
Find a starting estimate for daily energy.
Sweetener converter
Swap sweeteners with clearer proportions.
Fasting window planner
Map the times in your chosen routine.